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Source: U.S. Energy Information Administration, Form EIA-861 Annual Electric Power Industry Report, Form EIA-860, Annual Electric Generator Report, and Interstate Renewable Energy Council (IREC). 
Note: EIA collects data on the electric power industry in alternating-current megawatts (MWAC), while IREC and the PV industry in general discusses PV capacity in direct-current megawatts (MWDC), because solar panels produce DC power. For this chart, EIA assumed 80% efficient conversion from DC power to AC power.

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